/usr/share/applications/u1db-qt-gallery.desktop is in libu1db-qt5-examples 0.1.5+14.04.20140313-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Encoding=UTF-8
Type=Application
Exec=qmlscene /usr/share/u1db-qt/gallery/gallery.qml
Path=/usr/share/u1db-qt/gallery
Name=U1Db QML Example Gallery
Icon=/usr/share/icons/unity-icon-theme/places/svg/service-u1.svg
Terminal=false
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